You must not molest the stranger or oppress him, for you lived as a stranger in the land of Egypt.
Exodus 23:9
You must not oppress the stranger; you know how a stranger feels, for you lived as strangers in the land of Egypt.
Leviticus 19:33-34
When strangers sojourn with you in your land, you shall do them no wrong, the strangers who sojourn with you shall be to you as natives among you, and you love them as yourself; for you were strangers in the land of Egypt: I am the Lord your God.
Deuteronomy 10:17-20
Yahweh is your God of gods and Lord of lords, the great God, triumphant and terrible, never partial, never to be bribed. It is he who sees justice done for the orphan and the widow, who loves the stranger and gives him food and clothing. Love the stranger then, for you were strangers in the land of Egypt.
Deuteronomy 15:4a, 7-9
Let there be no poor among you then… Is there a poor man among you, one of your borders, in any town of yours in the land that Yahweh your God is giving you? Do not harden your heart or close your hand against that poor brother of yours, but be openhanded with him and lend him enough for his needs.
Deuteronomy 24:17-22
You must not pervert justice in dealing with a stranger or an orphan, nor take a widow’s garment in pledge. Remember that you were a slave in Egypt and that Yahweh your God redeemed you from there. That is why I lay this charge on you. When reaping the harvest in your field, if you have overlooked a sheaf in your field, do not go back for it. Leave for for the stranger, the orphan, and the widow, so that the Yahweh your God may bless you in all your undertakings. When you beat your olive trees, you must not go over the branches twice. Let anything left be for the alien, the orphan, and the widow. … Remember that you were a slave in the land of Egypt. That is why I lay this charge on you.
Deuteronomy 27:19
A curse on him who tampers with the rights of the stranger, the orphan and the widow.
Psalm 9:7-10
See, Yahweh is enthroned for ever.
He sets up his throne for judgment.
He is going to judge the world with justice, and pronounce a true verdict to the nations.
May Yahweh be a stronghold for the oppressed,
a stronghold when times are hard
Those who acknowledge your name can rely on you.
You never desert those who seek you, Yahweh.
Psalm 41:1-3
Happy is the man who cares for the poor and weak: if disaster strikes
Yahweh will come to his help.
Yahweh will guard him, give him life and happiness in the land;
ah, do not let his enemies treat him as they please!
Yahweh will be his comfort on his bed of sickness;
most carefully you make his bed when he is sick.
Psalm 82:2-4
No more mockery of justice,
no more favoring of the wicked!
Let the weak and the orphan have justice,
be fair to the wretched and destitute;
rescue the weak and needy, save them from the clutches of the wicked!
Psalm 103:6
Yahweh, who does what is right
is always on the side of the oppressed.
Proverbs 21:3
To act virtuously and with justice is more please to Yahweh than sacrifice.
Proverbs 21:13
The person who shuts their ear to the poor person’s cry shall plead and not be heard.
Proverbs 22:22-23
Because a person is poor, do not therefore cheat that person, nor at the city gate, oppress anybody in affliction; for Yahweh takes up their cause, and extorts the life of their extortioners.
Proverbs 31:8-9
Speak, yourself, on behalf of the dumb,
on behalf of all the unwanted; speak, yourself.
pronounce a just verdict, uphold the rights
Ecclesiastes 4:8-9
To the poor man lend an ear
and return his greeting courteously.
Save the oppressed from the hand of the oppressor,
and do not be mean-spirited in your judgments.
Isaiah 10:1-3
Woe to the legislators of infamous laws,
to those who issue tyrannical decrees,
who refuse justice to the unfortunate
and cheat the poor among my people of their rights
who make widows their prey,
and rob the orphan.
What will you do on the day of punishment,
when, from far off, destruction comes?
To whom will you run for help?
Where will you leave your riches?
Jeremiah 22:3
Yahweh says this: Practice honesty and integrity; rescue the man who has been wronged from the hands of his oppressor; do not exploit the stranger, the orphan, the widow; do no violence, shed no innocent blood in this place.
Amos 5:15
Hate evil, love good,
maintain justice at the city gate,
and it may be that Yahweh, God of Sabaoth,
will take pity on the remnant of Joseph.
Micah 6:8
What is good has been explained to you;
this is what Yahweh asks of you:
only this, to act justly,
to love tenderly
to walk humbly with your God.
Zechariah 7:8-10
(The word of Yahweh was addressed to Zechariah as follows:)
God said: Apply the law fairly, and practice kindness and compassion toward each other. Do not oppress the widow and the orphan, the settler and the poor man, and do not secretly plan evil against one another.
Malachi 3:5
Then I will draw near to you for judgment; I will be a swift witness against the sorcerers, against the adulterers, against those who swear falsely, against those who oppress the hireling in his wages, the widow and the orphan, against those who thrust aside the sojourner, and those who do not fear me, says the Lord of hosts.
Tobit 4:7-8
Set aside part of your goods for almsgiving.
New turn your face from any poor man.
Source: http://www.ncccusa.org